A joint service of the UK Ag Weather Center and the National Weather Service.
Today and Tonight.
Rainfall has really begun to increase in coverage across western
Mississippi this morning and will continue to slide east through the
morning. Looks like most everyone along and north of the I-85
corridor will see rain today, so went the highest possible for rain
chances. Looks like we may begin to see some clearing in the far
northwest this afternoon and then continue to slide south and east
through the night. Overall coverage will begin to decrease after
sunset as we loose what heating we have but rain chances remain on
the likely side through sunrise Monday. Thunder is not expected for
the day but rainfall will be moderate to heavy. Not expecting any
flooding concerns as we have been on the drier side for the last
several days. Although the rainfall through tonight could set up
potential for some flooding later this week and will be discussed in
the extended section. As the rain clears to the south overnight,
there could be some patchy fog that develops and reduces
visibilities to less than one mile and will need to monitor for a
dense fog advisory. Therefore we have added fog into the HWO for
tonight and Monday morning.
Monday through Sunday:
Southwesterly anti-cyclonic flow will be in place on Monday around
deep layer ridging centered between Florida and Cuba. A split flow
pattern will remain in place with a southern cutoff low over the
Desert Southwest and northern stream troughing over Canada. A
precipitation-reinforced quasi-stationary front will extend from
the Louisiana Gulf Coast northeastward toward southeast Alabama.
The eastern portion of this boundary may drift southward during
the morning following passage of a weak meso-low. Precipitation
forecast remains challenging due to weak/broad forcing associated
with weak waves in the southwest flow, and how quickly a residual
cold pool/area of dry air erodes in the wake of today's activity.
Showers and thunderstorms will develop late tonight/early tomorrow
morning along the frontal boundary in the vicinity of the
Louisiana Gulf Coast in a broad area of upper-level lift
associated with the right entrance region of an upper-level jet
streak and lift to the east-northeast. Generally favor a non-GFS
solution with a further south position of the front due to outflow
from today's activity and highest rain chances closer to the Gulf
Coast with some activity bleeding over into our southern
counties. A separate area of mid-level frontogenesis and moisture
will located further north closer to the I-20 corridor, which
could allow for some rain to fall there as well if low-level dry
air can be overcome. So, kept a mention of scattered showers in as
far north as Birmingham with lower confidence. Weak elevated
instability will be in place across the southern counties which
could allow for a rumble or two of thunder, but any surface-based
instability and potential for any stronger storms should remain
south of the forecast area. Also not expecting any heavy rain
during this time. Temperatures will hinge on precipitation and
lingering cool air. Will indicate highs in the upper 50s to low
60s north and mid to upper 60s south (low 70s possible far
southeast), but confidence is low as some high-res guidance keeps
temperatures across the north in the low 50s.
Some showers may linger near the I-20 corridor through the
evening. Focus for showers shifts to the northwest after midnight
as low-level isentropic lift strengthens ahead of the cutoff low
ejecting out of West Texas, and as the front lifts northward as a
warm front. This also results in a non-diurnal temperature trend
with temperatures steady/rising slightly after midnight.
Models indicate a west to east band of moderate to heavy rainfall
developing along and north of the warm front as unseasonably high
PWATs intersect the boundary. This area of heavy rain has been
trending northward, so the main threat of flooding seems to be
shifting north of the forecast area, but will continue to
monitor. The strong shortwave will move through the area late
Tuesday night and Wednesday morning while getting squeezed between
the subtropical ridge and troughing over the northeastern CONUS.
Models seem to be converging on the forecast area being in the
warm sector of a surface low moving across northern Mississippi
and middle Tennessee with low to mid 60s dewpoints and a few
hundred J/kg of CAPE ahead of a cold front/dry-line like feature.
There are still some key differences regarding the strength of the
low and associated backing of the low-level winds, and how soon
the low-level winds will veer out relative to the instability
arriving. If trends continue, a threat for isolated tornadoes late
Tuesday night and Wednesday morning could be added to the HWO in
later issuances given favorable wind profiles for mini-supercells.
Thursday through Sunday:
One dry day is expected on Thursday between systems with the only
forecast challenge being a possible wedge briefly trying to build
in. Focus then shifts to the next southern-stream trough ejecting
out of the western CONUS, and eventually phasing with a deep
northern stream trough engulfing almost the entire CONUS. Another
cold front looks to move into the area during the Friday/Friday
night timeframe. Any threat for severe weather will depend on the
degree of moisture return in the wake of Wednesday's system.
Models and ensembles have had many varying solutions for this
weekend regarding whether the front moves through, stalls, or
retreats off to the northwest, and whether the expected outbreak
of arctic air catches up to precipitation along the front. It's
certainly too early to use any deterministic model runs at this
point. General consensus continues to support only mentioning
liquid precipitation through the current forecast period at this
Alabama Forecast Discussion (NWS)
National Ag. Weather Outlook, International Ag. Weather Summary
Current Surface Map,
[2nd Source TWC]
Click here for UKAWC Point Agricultural, Lawn & Garden Forecast/Outlook in case of corrupt tables.
Regional Hourly Observations For WALKER County
500 AM CST SUN DEC 17 2017
CITY SKY/WX TMP DP RH WIND PRES REMARKS
BIRMINGHAM MOCLDY 46 27 47 NE3 30.17R
MONTGOMERY CLOUDY 39 31 72 E7 30.18R WCI 34
SHELBY CO ARPT PTCLDY 40 32 73 CALM 30.16R
MAXWELL AFB CLOUDY 39 34 83 CALM 30.17R
GREENVILLE FAIR 44 31 60 SE6 30.17R
SELMA FAIR 39 32 75 SE8 30.16R WCI 34
PRATTVILLE FAIR 41 31 67 CALM 30.17R
BESSEMER FAIR 43 28 55 SE9 30.14F
TALLADEGA FAIR 35 32 87 CALM 30.16F
PELL CITY SUNNY 34 34 100 NE5 30.16F WCI 30
MARION FAIR 42 32 67 SE9 30.11F
SYLACAUGA FAIR 46 32 58 SE6 30.15S
Current Agricultural Weather Conditions in Alabama
Based on observations at 500am CST, Sunday December 17, 2017
Across Alabama...temperatures are near 41 degrees north, near 46 degrees central, and near 56 degrees south. Current sky conditions are cloudy north, mostly cloudy central, and cloudy south. In the north, relative humidity is near 70%, and the dew point is near 32 degrees. In the central part of the state, relative humidity is near 47%, and the dew point is near 27 degrees. In the south, relative humidity is near 77%, and the dew point is near 49 degrees. Winds are from the east at 3 mph north, where conditions are favorable for spraying. Winds are from the northeast at 3 mph central, where conditions are favorable for spraying. Winds are from the southeast at 6 mph south, where conditions are favorable for spraying. The livestock cold stress index is in the no stress category north, no stress category central, and no stress category south. Based on current available observations, the highest temperature is 56 degrees at Mobile and Brookely Field. The lowest temperature is 36 degrees at Gadsden.
Current NOWCAST not available:
Nowcasts are not issued routinely during fair weather. Only when
precipitation or other significant weather is occuring in this county will these
forecasts be issued. Currently, there is no short term forecast in effect.
U.S. Radar Map,
All NWS Radars (In near-real time),
Current Livestock Heat Stress Index (LSI),
Current Wind Chill Map
Hazardous Weather Outlook For WALKER County, AL
512 AM CST Sun Dec 17 2017
DAY ONE Outlook through Tonight.
Patchy dense fog or low clouds will be possible across the northern
half of the area during the overnight. Visibilities may drop to or
below 1 mile at times for north of the Interstate 85 corridor.
DAYS TWO THROUGH SEVEN Monday through Saturday.
Patchy dense fog or low clouds may continue through 9 am Monday
morning. Visibilities may drop to or below 1 mile at times for north
of the Interstate 85 corridor.
SPOTTER INFORMATION STATEMENT
Activation of storm spotters and emergency management is not
expected at this time.
NWS Severe Weather Map , Convective Outlook
7-Day Forecast For WALKER County, Alabama
530 AM CST Sun Dec 17 2017
Rain showers in the morning, then rain likely in the
afternoon. Highs in the upper 40s. East winds 5 to 10 mph. Chance
of rain near 100 percent.
TONIGHT Cloudy. A 30 percent chance of rain in the evening.
Patchy dense fog after midnight. Near steady temperature in the
mid 40s. Light winds.
MONDAY Cloudy. Patchy fog in the morning. A 20 percent chance
of rain showers in the afternoon. Highs in the upper 50s. Light
MONDAY NIGHT Cloudy. Slight chance of rain showers in the
evening, then chance of rain showers after midnight. Lows in the
upper 40s. Light winds. Chance of rain 40 percent.
TUESDAY Rain showers and slight chance of thunderstorms. Highs
in the mid 60s. Southwest winds around 5 mph. Chance of rain
TUESDAY NIGHT Rain showers and chance of thunderstorms. Lows
in the upper 50s. Chance of rain 90 percent.
WEDNESDAY Cloudy. Rain showers and chance of thunderstorms in
the morning, then chance of rain showers in the afternoon. Highs
in the mid 60s. Chance of rain 80 percent.
WEDNESDAY NIGHT Colder. Mostly cloudy in the evening then
becoming partly cloudy. Lows in the mid 40s.
THURSDAY Partly cloudy. Highs in the lower 60s.
THURSDAY NIGHT Mostly cloudy. A 40 percent chance of rain
showers after midnight. Lows in the lower 50s.
FRIDAY Rain showers likely and slight chance of thunderstorms.
Highs in the lower 60s. Chance of rain 60 percent.
FRIDAY NIGHT Rain showers likely and slight chance of
thunderstorms. Lows in the lower 40s. Chance of rain 70 percent.
SATURDAY Cooler. Mostly cloudy with a 40 percent chance of
rain showers. Highs in the lower 50s.
12-48 Hr Surface Forecast Maps,
TWC 4-Panel Surface Forecast,
Day 1 Precip,
Day 2 Precip,
Days 1-5 Precip,
Severe Weather Pot.-Day 1,
Medium & Long Range Outlook For Alabama
6 TO 10 DAY 8 TO 14 DAY 30 DAY 90 DAY
DEC 22-26 DEC 24-30 DEC DEC-FEB
----------- ----------- -------- ---------
Temperature: Normal Normal Above Above
Precipitation: Above Above Below Below
.... Medium and long range outlooks provided by NCEP/K. Thomas Priddy
5 Day Rainfall Forecast,
6 to 10 Day ,
8 to 14 Day ,
Sunday December 17, 2017 the 351th Day of Year
Distance 0.999725 AU
Rise 07:47 EST Set 17:43 EST
Transit Meridian 12:44 EST
Civil Twilight Begins 07:20 EST Ends 18:09 EST
Calculations made for central point in the state.
Time in ET -- and will vary due to location and
elevation -- Priddy
Historical Weather And Climate Facts For Today
HISTORIC WEATHER EVENTS
A three week blockade of snow began at Portland OR. A record December total
of 34 inches was received. (David Ludlum)
A severe icestorm struck central Illinois. It coated the ground with nearly
two inches of glaze at Springfield. The storm caused 21 million dollars
damage along with much hardship. Ice was on the trees until the 4th of
January, and electricity was not restored until January 10th. (David
An icestorm in western New York State resulted in much damage and hardship.
A Buffalo report stated, "one was kept awake by the breaking limbs, which
snapped off with a report much louder than a rifle shot." (17th-18th) (The
A storm in the southwestern U.S. brought heavy rain and heavy snow to parts
of California, Nevada, Arizona, Utah and New Mexico. Charleston NV was
blanketed with 12 inches of snow. Lake Havasu City AZ was drenched with
2.26 inches of rain. (Storm Data) (The National Weather Summary)
Squalls brought locally heavy snow to the southeastern shores of Lake
Michigan. Totals in Michigan ranged up to 14 inches at Harvey. Totals in
Ohio ranged up to 16 inches at Chardon. (The National Weather Summary)
Twenty-one cities from Kentucky to Pennsylvania reported record low
temperatures for the date, including Columbus OH with a reading of 12
degrees below zero. Heavy snow continued in the Colorado Rockies. Vail
received 65 inches of snow between the 14th and the 18th of December.
Steamboat Springs was buried under 74 inches, and reported a total of 108
inches of snow between the 10th and the 18th of the month. (The National
Weather Summary) (Storm Data)
Ag Weather Center, Department of Biosystems & Agricultural Engineering, University of Kentucky